Invite your first grader to enter the world of the teen numbers as she starts writing 11-20. Practice tracing the name of each number before writing it.

So your child has mastered the numbers 1-10 -- what's next? How about a bright and colorful number pyramid that challenges them to tackle numbers 11-20?

This page presents the altocumulus cloud, the kind of cloud that often comes before a thunderstorm.

Meet the altostratus cloud, a thin cloud that sometimes makes rain, in this earth sceince worksheet.

Meet the stratocumulus cloud, the kind of cloud that tend to gather in groups when a storm is on the way.

Ever lay on your back to watch the clouds? With this cloud chart you and your little scientist can identify the different types of cloud formations.

Have some fun with this cootie catcher paper project, perfect for using as a classroom icebreaker or a family travel game!

Learn your clouds with this coloring series of cloud types that merges science with coloring fun.

Studying earth science? Learn about the different types of clouds with the series of cloud types.

Learn all about the cumulonimbus cloud, more commonly known by a much more fearsome name: the thundercloud!

Turn a patchy day into a fun science adventure with this cloud gazing worksheet! Draw the clouds you spot, and then identify which type they are.

Ever lay on your back to look at the clouds? Now you'll know which types of cloud make up all those silly shapes you see with this diagram.

This story starter featuring an alien butterfly catcher will surely put your little one in a silly mood! Add color to the picture and write a story about it.

This automobile-themed worksheet helps students practice counting the numbers 11–20.

How do you make learning addition and subtraction facts fun? Try your hand at "popping" colorful balloons showing a sum or difference of eleven!

Inspire interest in historical sites by learning about the New 7 Wonders of the World with this fun cootie catcher activity.

The 11s times tables are fairly simple. Review the pattern for 11s, and then learn a cool new strategy for multiplying bigger numbers by 11!

This science page presents the cumulus cloud, the puffiest, fluffiest kind of cloud that's made for playing outdoors under.

Assess your students’ understanding of subtraction by having them solve subtraction problems within 20.

Meet the stratus cloud, a low-hanging kind of cloud that usually comes out when it rains, in this earth science worksheet.

Add it up! Assess your students’ understanding of addition by having them solve addition problems within 20.

Give your young math learner practice composing numbers 11–19 with this addition strategies worksheet!

Can you figure out what I'm thinking of in 20 questions or less? Step up to the challenge with a ready-to-print scorecard for this classic logic game!

The second in a series of six, this addition worksheet gives learners more practice composing numbers 11–19!

The third in a series of six, this addition worksheet gives learners more practice composing numbers 11–19!

The fourth in a series of six, this addition worksheet gives learners more practice composing numbers 11–19!

The fifth in a series of six, this addition worksheet gives learners more practice composing numbers 11–19!

Use this glossary with the EL Support Lesson Plan: Adding Within 20.

Gain expertise with addition sentences within 20 in this helpful math worksheet!

Use this number line as a tool to practice adding and subtracting within 20.